Floor scrolling speed in ZDaemon is incorrect in some situations. Here is the test wad. Just join the game and wait. In Boom it takes 0 seconds to finish the map but in ZDaemon it takes 14 seconds.

If I understand correctly, this has to do with the fact that the scroller linedef affects more than one sector. For some reason in Boom this results in faster scrolling speed. Here is the test wad 2 that proves this. I merged 4 sectors into one and now the scrolling speed in Boom is a lot slower (same as in ZDaemon on both maps).

See my answer to mem's question on Doomworld; it explains what exactly happens, and it should provide more than enough pointers on how to remedy this in ZDaemon; if someone is still working on it, that is.